In the published article [1], the Acknowledgement section omitted the assistance provided by Dr. Richard Palin in drafting Figures 11 and 14. The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. The correct version is as follows: Acknowledgments: The authors would like to thank “The Center for Mining Sustainability”, Universidad Nacional San Agustín, Arequipa, Perú, Colorado School of Mines for providing the funds to perform this study. We thank Century Mining Company and the Small-Scale Miners of Mollehuaca for providing access to the mine sites. We thank Jim Crowley from the Isotopic Geology Laboratory at Boise State University for performing the geochronological analysis and Heather Lowers at the United States Geological Survey Center for Geology, Geophysics and Geochemistry for assistance with electron microprobe analyses. We thank Richard Palin in drafting Figures 11 and 14.